Bug in my code causing crash Qt Spectrogram

Yippiyak

Here is the code I believe is suspect as there is a direct reference to Line 45 in my showpeak function in the call stack.

void ShowPeak::updatePeak()
{
m_peak = QPointF(0, -100000);

QXYSeries* series = static_cast<QXYSeries*>(m_chart->series()[0]);
QValueAxis* axisX = static_cast<QValueAxis*>(m_chart->axisX(series));

for (const QPointF& p : series->pointsVector())
{
    if (p.y() > m_peak.y()
        && p.x() >= axisX->min()
        && p.x() <= axisX->max())
    {
        m_peak = p;
    }
}

}

I am using multithreading, but I am not sure what exactly is causing my project to fail. The error code is:

Exception thrown: read access violation.
_Tgt was 0x2990070.

Many thanks to anyone who can provide any insight.

J

aha_1980

@Yippiyak

... and line 45 is which one?

thanks

Yippiyak

@aha_1980
for (const QPointF& p : series->pointsVector())

SGaist

Hi,

Are you sure that this pointer is valid ?
Also, you should rather use dynamic_cast (or qobject_cast if it’s for a QObject based class) and check the returned value against null_ptr.